5results about How to "Uniform internal organization" patented technology

The invention discloses a preparation method of an ultra-large-diameter copper-nickel alloy seamless tube, which comprises the following steps of: obtaining a cold-rolled raw material which is uniform in internal structure and free from pores by using forging and cross piercing methods, and then performing cold rolling to eliminate an as-cast state, performing hot working on the structure to fully refine crystal grains and drawing the raw material which meets the equipment requirements in diameter and wall thickness; the large-diameter seamless pipe with the diameter of 508 mm is prepared, and the produced large-diameter seamless pipe is excellent in mechanical performance, uniform in grain size and internal structure and high in practicability and economic benefits.

The invention discloses a multi-module combined plate-type cross wedge rolling die, relates to the technical field of cross wedge rolling, overcomes the defects that in the prior art, the inside and the outside of a machined corrugated shaft are stripped, and a roller type rolling machine is too large in size, and mainly adopts the technical scheme that the multi-module combined plate-type cross wedge rolling die is used for solving the problems. A forming space used for forming a corrugated shaft is formed between the two forming supporting assemblies. At least one of the two forming supporting assemblies is a first track assembly, a plurality of adjacent transverse rolling modules form a forming wedge, pre-extrusion stripes are further arranged on a plurality of track plates in front of the forming wedge, or the two forming supporting assemblies are a second track assembly and a third track assembly, the second track assembly is provided with pre-extrusion stripes, and the third track assembly is provided with pre-extrusion stripes. And the third track assembly is provided with a forming wedge consisting of a plurality of same adjacent transverse rolling modules, so that the corrugated shaft sequentially passes through the pre-extrusion stripes and the forming wedge during forming. The invention further discloses a rolling method for machining the corrugated shaft through the die.

The application belongs to the technical field of precious metal sputtering target material, and discloses a preparation method of a nickel-platinum alloy target material for magnetron sputtering. The preparation method of the nickel-platinum alloy target material for magnetron sputtering comprises the following steps: (1) mixing nickel powder and platinum powder and ball milling; (2) hot-pressing sintering; (3) smelting; (4) rolling; and (5) performing shape processing after annealing to obtain the nickel-platinum alloy target material. The nickel-platinum alloy target material prepared by the method has uniform internal grain structure and high density, and the nickel-platinum alloy target material has high yield, fine grains and stable sputtering, which is beneficial to obtaining a high-quality thin film with uniform thickness.

The invention discloses a Mn-containing ultralight high-toughness weak-texture magnesium-lithium alloy sheet and a preparation method thereof, and belongs to the technical field of metal materials. The preparation method comprises the following steps: preparing materials (containing at least one of a pure magnesium ingot, a pure zinc ingot, a magnesium-lithium intermediate alloy, a magnesium-calcium intermediate alloy and a magnesium-erbium / magnesium-manganese intermediate alloy), smelting under argon protection, casting at 720-750 DEG C, cooling, carrying out linear cutting to obtain a cast ingot, preheating at 200-300 DEG C, extruding into a plate blank, and carrying out small-pass (2-4 passes) large-deformation rolling at 25-200 DEG C. According to the invention, the comprehensive mechanical properties of the alloy are improved, the basal texture is weakened and the room-temperature formability is improved by adding a light Ca element, a grain refined Mn element or a rare earth Er element through a novel short-distance efficient deformation process of extrusion pre-deformation and small-pass large-deformation online heating rolling, so that the unification of ultra-light weight, high toughness and high formability is realized, and the production cost is reduced. The method is simple in process, low in cost, efficient and suitable for the fields of aerospace, 3C electronics and the like.

The application discloses a kind of high-nitrogen high-aluminum new energy automobile gear steel and manufacturing method thereof, steel chemical composition mass percentage: C 0.18-0.25%, Si 0.2-0.4%, Mn 0.6-0.9%, Cr 0.8-1.2%, Ni 0.3-0.6%, Mo≤0.10%, Al 0.05-0.09%, N 0.018-0.025%, P≤0.01%, S≤0.005%, the balance Fe and impurities.Preparation method: electric furnace smelting→LF refining→VD vacuum degassing nitrogen-increasing→continuous casting→grading temperature control rolling.The application forms dispersed AlN grain refinement by Al-N cooperation, strictly controls harmful element to improve purity, has high strength, high toughness, high wear resistance and high fatigue resistance, tensile strength≥1200MPa, adapts new energy automobile high speed high torque condition, process is stable and can be mass-produced.